Since 2002, I have been facilitating lean Six Sigma projects and coaching other belts through their projects. Combining tools is a technique I use with teams when potential root cause analysis through a fishbone diagram does not show any obvious direction. From using the fishbone diagram, most quality professionals know there are usually three outcomes: 1. One of the bones in the diagram is full of potential causes, leading a team to focus on a particular area (Figure 1). 2. The same potential root causes appear in several bones of the diagram, indicating a systemic cause that, if eliminated, will address several areas of concern.
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